INTERACTIVE PEN FUNCTION The PLC-WL2503 is equipped with an interactive function. Thanks to a built in sensor and newly developed software, the projection white screen allows it to be written on with a built-in infrared light pen while using a PC. SHORT THROW PROJECTION FROM ONLY 34 INCHES AWAY The PLC-WL2503 can project a full 80-inch diagonal image from a distance of only 34 inches. Teachers can project images onto the screen and produce no shadow on the screen. This means they can use large images even in relatively small rooms.